Adds Redis Memory extension class

[justin-cechmanek]

Why are these changes needed?

This PR adds the RedisMemory class to allow for developers to use Redis vector search for agent memory. Redis vector db offers a persistent store and the ability to semantically search for relevant memories.

Related issue number

None

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

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